Was the battery ever FULLY charged back up after alternator failure? Have you had battery checked in addition to alternator? Is there something draining it while it is off, extra electronics, ac fan spinning up front, etc.? Will it not turn over at all or does it just seem weak?

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2010 Lexus RX350 still new
2003 BMW X5 3.0i w/sport package w/68K miles. (gone Thank God!)
2002 Dodge Ram 2500 4X4 cummins diesel w/198K miles, custom repo truck
2009 Scion tC w/46K miles
2007 Suzuki SV650 custom streetfighter
2000 Lexus GS400 w/165K miles